And joseph h



w. DouGLAss l n. H. Bauma.

` Steam-Boilers.

Patented'Septe'mber 2,1873.

UNrrn WITHEROW DOUGLASS, OF PITTSBURG, PENNSYLVANIA, AND JOSEPH H.

' BROWN, OF YOUNGSTOWN, OHIO. 1

IMPROVEMENT IN STEAM-BOILERS.

I Specification forming part of Letters Patent No. 142,330, dated September 2, 1873; application filed March 13, 1873.

To all whom it may concern:

Beitknownthat we,W1TnERowDoUeLAss, of Pittsburg', in the county of Allegheny, Pennsylvania, and JOSEPH H. BROWN, of Youngstown, in the county of Mahoning and State of Ohio, have invented a new and useful Improvement in Steam-Boilers; and we do hereby declare the following to be a full, clear, and eX- act description thereof, reference being had to the accompanying drawing forming a part of this specification, in which- Figure l is a side elevation of our improved boiler. Fig. 2 is a vertical section, and Fig. 3 is a plan view ofthe same.

, Like letters of reference indicate like parts in each.

Our invention consists in combining, with the exterior casing of an upright cylindrical boiler, a passage for the admission of heatfrorn an outside source to the boiler, and also air-ports for the supply of oxygen to the unconsumed gases thus introduced inside the casin g; also, in an improved arrangement of a nozzle and steam and gage pipes in connection with an uprightcylindrical boiler; andy also in the combination of the several devices involved in the construction of the boiler.

To enable others skilled in the art to make and use our invention, We'will describe its construction and mode of operation.

The boiler consists of the upright cylinder a, which is made of boiler-iron in the usual i way. This boiler is provided with a steamdrum, b, which is of smaller diameter, and is placed on the upper end of the cylinder. The steam-drum b is lined with nre-brick, c, which are built upon the shoulder or-ledge a. The

V cylinder a is surrounded by a casin g or shell,

d, forming the annular chamber le between them. The shell d is lined with fire-brick f to protect it and retain the heat, and is provided with an opening, g, for the entrance'of heat, which, passing into the chamber e, envelops the boiler a and passes up and out the top e. Extending out from the boiler a through the side of the shell is a nozzle, h, which is closed by a head, h. This is for the purpose of protecting the steam-pipe fi and the gage-pipes n and n from the llame in the annular chamber e. There is no access to the boiler a except by crossing the chamber e, and if the steam and gage pipe crossed it unprotected they would w speedily be burned out;v hence we carry them across the chamber ein the nozzle h, which, being filled with water, will not burn out. The nozzle h may be arranged at any suitable point below the water-line ofthe boiler. The steampiper' leads down from the steam-drum b, and by any suitable connection the steam may be led from it to any desired point. The gagepipes a a lead from points of different heights in the drum or boiler, and operate in the same manner and to the same end as gages in ordinary boilers. Water is supplied to the boiler a by means of the pipe m. At any desired point at the bottom of the cylindrical shell d is a door, l, which opens into the chamber e opposite to the man-hole p in the boiler a. The door Z and man-hole p provide an entrance into the boiler forcleaning and other purposes. The man-hole is closed by a head, p. By means of this boiler we are enabled to utilize the waste heat which passes oft' through the stack of puddling and other furnaces. The neel; of the furnace leads to the opening g, and the smoke and waste heat from the fur-t nace pass into the annular chamber e, through which they ascend, heating the water in the boiler a, and escape at the top. Thus the case e is simply the stack of the furnace, in which there is arrangedl a boiler for the generation of steam. Among the waste products of coinbustion which pass oft' through the stack there are a number of highly combustible gases which only require the presence of oxygen to cause them to burn. We make a number ot' ports or openings, r, through the outer case e for the admission of atmospheric air to supply oxygen to cause the combustion of the unconsumed gases. The air passing through the ports r mingles with the gases, causing them to burn with great heat. This aids largely in generating steam in the boiler a. The admission of air into the chamber e is regulated by plugs or doors in the ports r..

This boiler is also designed to be used with an individual or separate fire-box, in which case the tire-box is placed in front of the opening g, and is of anydesired or known construction.

The boiler a is entirely inclosed, so as not to be exposed to the external atmosphere, and the heat comes in contact with every part of its external surface, so that We have a very large heatingsurface, and guard against loss of heat by radiation.

This boiler is especially desirable in many eases on account of the small surface-space required, and in case of explosion the pressure is chiefly upward and simply raises the top oli". Another advantage is that, by the combustion at the ports r, the temperature in the chamber eis kept at a high point, even after the colder surface of the lower end of the boiler has been en countered.

What we claim as our invention, and desire to secure by Letters Patent, isy l. In combination with the upright cylindrical boiler a and its annular casing d, the opening g for the admission of heat from a paddling-furnace or other exterior fire, and the ports r for supplying air to the unconsumed gases in the annular lue e, all arranged substantially as set forth.

2. The boiler a, having a nozzle7 h, in combination with the steam or gage pipes fi n a', substantially as and for the purposes described.

3. The steam-generator consisting of the boiler a, steam-drum b, nozzle h, steam-pipe i, annular chamber e, and outer shell d, combined and arranged substantially as described.

In testimony whereof we, the said VVITIL EROW DoUGLAss and JosEPH H. BROWN, have hereunto set our hands.

WITHEROW DOUGLASS. JOSEPH H. BROWN. fitnesses as to W. DOUGLAss:

A. S. NICHOLSON, Tiros. B. KEER. Witnesses as to J. H. BROWN:

SIDNEY STRONG, WM. R. PERKINS. 

